Fix file browser in qmlvideo example.

Use QUrl::fromLocalFile() to get Windows drive handling
right. Emulate its behavior in QML code. Fix up() to terminate
correctly.

Task-number: QTBUG-32139

Change-Id: Iec6d9f96fbe2181c939e9dbbe6aa042eac630918
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>

examples/multimedia/video/qmlvideo/qml/qmlvideo/FileBrowser.qml

@@ -101,7 +101,11 @@ Rectangle {
                 Rectangle {
                     id: wrapper
                     function launch() {
-                        var path = "file://" + filePath;
+                        console.debug("launch " + filePath);
+                        var path = "file://";
+                        if (filePath.length > 2 && filePath[1] === ':') // Windows drive logic, see QUrl::fromLocalFile()
+                            path += '/';
+                        path += filePath;
                         if (folders.isFolder(index))
                             down(path);
                         else
@@ -306,7 +310,7 @@ Rectangle {
                     MouseArea { id: upRegion; anchors.centerIn: parent
                         width: 56
                         height: 56
-                        onClicked: if (folders.parentFolder != "") up()
+                        onClicked: up()
                     }
                     states: [
                         State {
@@ -352,6 +356,8 @@ Rectangle {
 
             function up() {
                 var path = folders.parentFolder;
+                if (path.toString().length === 0 || path.toString() === 'file:')
+                    return;
                 if (folders == folders1) {
                     view = view2
                     folders = folders2;